EP1272010A1 - Organisches el-element - Google Patents

Organisches el-element Download PDF

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Publication number
EP1272010A1
EP1272010A1 EP01941196A EP01941196A EP1272010A1 EP 1272010 A1 EP1272010 A1 EP 1272010A1 EP 01941196 A EP01941196 A EP 01941196A EP 01941196 A EP01941196 A EP 01941196A EP 1272010 A1 EP1272010 A1 EP 1272010A1
Authority
EP
European Patent Office
Prior art keywords
transparent electrode
segment
portions
emission
luminance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP01941196A
Other languages
English (en)
French (fr)
Other versions
EP1272010A4 (de
Inventor
H. c/o R&D Center of Nippon Seiki Co. Ltd. WAKAI
J. R&D Center of Nippon Seiki Co. Ltd. MARUYAMA
H. c/o R&D Center of Nippon Seiki Co. Ltd OHKAWA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Seiki Co Ltd
Original Assignee
Nippon Seiki Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Seiki Co Ltd filed Critical Nippon Seiki Co Ltd
Publication of EP1272010A1 publication Critical patent/EP1272010A1/de
Publication of EP1272010A4 publication Critical patent/EP1272010A4/de
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional [2D] radiating surfaces
    • H05B33/26—Light sources with substantially two-dimensional [2D] radiating surfaces characterised by the composition or arrangement of the conductive material used as an electrode
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/302—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements characterised by the form or geometrical disposition of the individual elements
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/19—Segment displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/81—Anodes
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays

Definitions

  • the present invention relates to an organic EL (electroluminescence) element, and particularly to an organic EL element which can realize an improvement in the difference of an emission luminance due to the difference of emission rise time in a plurality of light emitting portions.
  • Japanese patent Laid-Open No. 234681/1993 or the like discloses an organic EL element in which a transparent electrode 2, an organic layer 3, a back electrode 4 are successively formed on a translucent insulating substrate 1, and the organic layer 3 is constituted by, for example, a hole injecting layer, a hole transporting layer, a light emitting layer, and an electron transporting layer.
  • a direct current power supply of several tens of volts is connected to the transparent electrode 2 and the back electrode 4 to supply an electric current between the electrodes 2 and 4, so that the organic layer 3 emits light, and the light is irradiated toward the outside through the substrate 1.
  • Its light emitting portion is generally determined by the pattern of the transparent electrode 2, except for a dot matrix type.
  • a display portion D and a wiring pattern L for supplying an electric current to this are patterned and are formed on the substrate 1 of glass or the like by using a translucent conductive material such as ITO and by a method such as vapor deposition.
  • the display portion D is formed to be a size larger than the segment portion (region indicated by a dotted line in Fig. 4) S corresponding to the emission in a specific shape, and as shown in Fig. 3, an insulating layer 5 formed by a suitable measure, such as spin coating or roll coating, using an insulating material such as polyimide, acrylic, or phenol, is positioned between the transparent electrode 2 and the organic layer 3.
  • the part of the display portion D other than the segment portion S (the part covered with the insulating layer 5) is a part of the wiring portion L, and forms the insulating layer 5 except for the emission in a specific shape. That is, by removing the insulating layer 5 on the segment portion S, the shape of the segment portion S has been made the desired emission in a specific shape.
  • the wiring portions L1, L2, and L6 (former group) of the segment portions S1, S2 and S6 positioned above have the extension distances longer than the wiring portions L3 to L5 and L7 (latter group) of the segment portions S3 to S5 and S7 positioned below, and the capacitance becomes larger.
  • the difference of the emission rise time converts into difference of emission luminance in the segment portions S1 to S7, and the display quality is lowered.
  • an electric current is supplied by pulse driving to control emission/non-emission of the segment portions S1 to S7, when the frequency of the pulse or the duty ratio is changed to adjust the emission luminance to a desired value, in the case where the frequency is high or the pulse width is short, there is a case where the segment portions S1, S2, and S6 connected to the former and having a long emission rise time do not emit light.
  • the invention is an organic EL element comprising a transparent electrode positioned on a non-emission surface of a translucent substrate, a luminous organic layer positioned on the transparent electrode, and a back electrode positioned on the organic layer and facing the transparent electrode, the transparent electrode formed with a plurality of segment portions for determining an emission in a specific shape and a plurality of wiring portions for separately supplying electric currents to the respective segment portions, and is characterized in that the area of the wiring portion of the segment portion having a high emission luminance is enlarged such that the emission luminance of the segment portion falls within a range of from a minimum luminance in the segment portions to a luminance 30% higher than that.
  • an organic EL element comprises a transparent electrode positioned on a non-emission surface of a translucent substrate, a luminous organic layer positioned on the transparent electrode, and a back electrode positioned on the organic layer and facing the transparent electrode, the transparent electrode forming a plurality of segment portions for determining an emission in a specific shape and a plurality of wiring portions for separately supplying electric currents to the respective segment portions, and is characterized in that the segments are arranged in a shape of a numeral 8, and the wiring portion of the segment portion having a high emission luminance is extended into an inside of a display of the numeral 8 of the segment portions to enlarge an area of the wiring portion such that the emission luminance of the segment portion falls within a range of from a minimum luminance in the segment portions to a luminance 30% higher than that.
  • a feature is that an insulating layer is positioned between the wiring portions of the transparent electrode and the organic layer.
  • an organic EL element comprises a transparent electrode positioned on a non-emission surface of a translucent substrate, a luminous organic layer positioned on the transparent electrode, a back electrode positioned on the organic layer and facing the transparent electrode, the transparent electrode forming a plurality of segment portions for determining an emission in a specific shape and a plurality of wiring portions connected to a constant current source and for separately supplying electric currents to the respective segment portions, and an insulating layer formed between the wiring portions and the organic layer except for the light emitting shape, and is characterized in that the segments are arranged in a shape of a numeral 8, and the wiring portion of the segment portion having a high emission luminance is extended to a place inside a display of the numeral 8 of the segment portions and covered with the insulating layer to enlarge an area of the wiring portion such that the emission luminance of the segment portion falls within a range of from a minimum luminance in the segment portions to a luminance 30% higher than that.
  • an organic EL element comprises a transparent electrode positioned on a non-emission surface of a translucent substrate, a luminous organic layer positioned on the transparent electrode, and a back electrode positioned on the organic layer and facing the transparent electrode, the transparent electrode forming a plurality of segment portions for determining an emission in a specific shape and a plurality of wiring portions for separately supplying electric currents to the respective segment portions, and is characterized in that a capacitance of the wiring portion of the segment portion having a high emission luminance is increased such that the emission luminance of the segment portion falls within a range of from a minimum luminance in the segment portions to a luminance 30% higher than that.
  • an organic EL element comprises a transparent electrode positioned on a non-emission surface of a translucent substrate, a luminous organic layer positioned on the transparent electrode, and a back electrode positioned on the organic layer and facing the transparent electrode, the transparent electrode forming a plurality of segment portions for determining an emission in a specific shape and a plurality of wiring portions for separately supplying electric currents to the respective segment portions, and is characterized in that an area of the wiring portion of the segment portion having a low emission luminance is decreased such that the emission luminance of the segment portion falls within a range of from a maximum luminance in the segment portions to a luminance 30% lower than that.
  • a feature is that an insulating layer is positioned between the wiring portions of the transparent electrode and the organic layer.
  • an organic EL element comprises a transparent electrode positioned on a non-emission surface of a translucent substrate, a luminous organic layer positioned on the transparent electrode, and a back electrode positioned on the organic layer and facing the transparent electrode, the transparent electrode forming a plurality of segment portions for determining an emission in a specific shape and a plurality of wiring portions for separately supplying electric currents to the respective segment portions, and is characterized in that a capacitance of the segment portion having a low emission luminance is decreased such that the emission luminance of the segment portion falls within a range of from a maximum luminance in the segment portions to a luminance 30% lower than that.
  • In denotes a value of an electric current supplied from a constant current source connected to the wiring portion Ln
  • J denotes a current density obtained by dividing the current value In by an area Ssn of the segment portion Sn.
  • the current value In is determined so that the current density J comes to have a constant value in the respective segment portions Sn.
  • an area of the wiring portion Ln is made Sln.
  • the light emission voltage Vem and the current density J are constant irrespective of the area Ssn of the segment portion Sn, and when the structure of the organic EL element is determined, the capacitance Csn becomes constant in the element, and accordingly, Vem/(J/Cs) is made a constant ⁇ .
  • the emission rise time t in the segment portion Sn can be made theoretically constant.
  • the difference of the emission rise time t causes the difference of the emission luminance, however, according to human optics, the difference is hard to visually recognize in the range where the emission luminance is higher (lower) than the minimum luminance (maximum luminance) by about 20 to 30%. Accordingly, as in this embodiment, in the case where there is no large difference among the areas Ss1 to Ss7 of the segment portions S1 to S7, the problem of the difference of the emission luminance due to the difference of the emission rise time t is greatly influenced by a large difference existing in the wiring portion Ln, and it becomes a problem between the segment portions S1, S2 and S6 (former) positioned above and the segment portions S3 to S5 and S7 (latter) positioned below.
  • the emission rise time t becomes long, and the value of Cln/Csn becomes small, the emission rise time t becomes short.
  • the capacitances Csn become substantially equal to each other, and the capacitance C11, C12, C16 of the former becomes large as compared with the capacitance C13 to C15, C17 of the latter, and hereby, the emission rise time t1 of the former becomes longer than the emission rise time t2 of the latter.
  • the emission rise time t2 is made to approach the emission rise time t1
  • the emission rise time t1 is made to approach the emission rise time t2. That the emission rise time t1 is made to approach the emission rise time t2 is to shorten the emission rise time t1, and in order to realize this, Cln (Sln) is made small, and/or Csn (Ssn) is made large. That the area Sln is made small is to shorten the wiring portion Ln, and this receives restrictions by the arrangement of the segment portion Sn and is not easy. Besides, enlargement of the area Ssn can not be freely carried out since the shape of the segment portion Sn is determined in accordance with the design.
  • a suitable method can be adopted, for example, their lengths are made longer, or their widths are made wider.
  • the shapes of the display portions D3 to D5 and D7 are made such that they are extended to a place which is the inside of the display of the segment portions S1 to S7 and is covered with the insulating layer, that is, they are extend into the inner region surrounded by the segment portions S3 to S5 and S7, in which the segment portions S1 to S7 and the wiring portions L1 to L7 are not provided, and the areas of the display portions D3 to D5 and D7 are increased, so that the areas S13 to S15 and S17 are enlarged.
  • the display portions S3 to D5 and D7 include the segmentportions S3 to S5 and S7, that the areas of the display portions S3 to D5 and D7 are enlarged without changing the shapes of the segment portions S3 to S5 and S7 is substantially to increase the areas S13 to S15 and S17 of the wiring portions L3 to L5 and L7 since the portions function as part of the wiring portions L3 to L5 and L7.
  • the area Sln of the wiring portion Ln of the segment portion Sn having a small emission rise time t is enlarged such that the emission luminance falls within the range of from a minimum luminance to a luminance higher than the minimum luminance by 30% (preferably, 20%), and as a result, the difference of the emission luminance in the whole organic EL element can be made to fall within a range to such a degree that it can not be visually recognized, and the display quality can be improved.
  • the present invention can provide an organic EL element which improves a difference of emission luminance due to a difference of emission rise time in a plurality of light emitting portions, and can improve the display quality of the organic EL element.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
EP01941196A 2000-09-14 2001-06-22 Organisches el-element Ceased EP1272010A4 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2000285215 2000-09-14
JP2000285215A JP3560150B2 (ja) 2000-09-14 2000-09-14 有機ｅｌ素子
PCT/JP2001/005382 WO2002023955A1 (en) 2000-09-14 2001-06-22 Organic el element

Publications (2)

Publication Number Publication Date
EP1272010A1 true EP1272010A1 (de) 2003-01-02
EP1272010A4 EP1272010A4 (de) 2005-03-02

Family

ID=18769320

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01941196A Ceased EP1272010A4 (de) 2000-09-14 2001-06-22 Organisches el-element

Country Status (6)

Country Link
US (1) US6975066B2 (de)
EP (1) EP1272010A4 (de)
JP (1) JP3560150B2 (de)
KR (1) KR100767965B1 (de)
CN (1) CN1239049C (de)
WO (1) WO2002023955A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3405349B1 (ja) * 2002-01-11 2003-05-12 株式会社デンソー 有機ｅｌ表示装置
KR100768972B1 (ko) * 2002-11-25 2007-10-22 도시바 마쯔시따 디스플레이 테크놀로지 컴퍼니, 리미티드 유기 ｅｌ 표시 패널
KR101434953B1 (ko) * 2013-02-15 2014-08-28 지스마트 주식회사 투명전광판을 구비한 탑승교
KR101512661B1 (ko) * 2013-12-10 2015-04-17 지스마트 주식회사 창틀에 설치가능한 복층 구조를 갖는 투명전광판 및 그 제조방법
JP2017204434A (ja) * 2016-05-13 2017-11-16 株式会社小糸製作所 車両用灯具、及び有機ｅｌ素子の検査方法

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Also Published As

Publication number Publication date
US6975066B2 (en) 2005-12-13
KR20020067516A (ko) 2002-08-22
JP3560150B2 (ja) 2004-09-02
EP1272010A4 (de) 2005-03-02
CN1389086A (zh) 2003-01-01
CN1239049C (zh) 2006-01-25
US20020163298A1 (en) 2002-11-07
WO2002023955A1 (en) 2002-03-21
JP2002093585A (ja) 2002-03-29
KR100767965B1 (ko) 2007-10-17

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